Adjusting The Neck Pad - Kirby Morgan 77 Operation And Maintenance Manual

B CAUTION
Avoid trimming neoprene neck dams
too much. Neoprene neck dams will
loosen over time as they are used and
the cells of the foam neoprene break
down. If you trim the neck dam too
much it will be too loose and will leak.
Trim the neck dam until it is snug,
then stretch it before use.
Trimming the neck dam.
Teflon
®
Washer
Washer
Hinge bolt
Locking Collar components.
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
Washer
Neck pad
Trim only 1/4 inch off the neck dam at a time. When
you are done, the neck dam must be just tight enough
so that it does not leak. This may feel a bit snug out
of the water, but should be comfortable underwater.
If you have a neoprene neck dam, it may also need to
be stretched for it to fit properly. Trim the neck dam
until it is still snug, then stretch it by sliding it over
a scuba tank and allowing it to sit overnight. If you
still cannot get the proper fit by stretching the neck
dam, it must be trimmed further. Do not trim more
than 1/4 inch at a time.
As the neoprene neck dam ages, it will become looser,
due to a natural breakdown of the cells. This is par-
ticularly true if the helmet is locked in and out of a
bell or saturation system. As the neck dam becomes
worn it will need replacement to ensure that it seals
properly.

3.4.4 Adjusting the Neck Pad

Another component that controls the fit of the Kirby
Morgan helmet is the adjustable neck pad. The neck
pad, which is mounted on the locking collar, slides
back and forth along the locking collar body for
adjustment to fit different divers. Two screws and
adjustment nuts lock the neck pad plate to the locking
collar. Loosening these screws from the mount nuts
allows the neck pad to be adjusted.
Nut
Adjustment nut
Locking collar
T-washer
Kirby Morgan 77
®
Washer
Screw
35